Aggregate Demand

What Aggregate Demand covers

Aggregate demand is examined in Unit AS 2, Managing the National Economy. It covers the four components of aggregate demand, why the aggregate demand curve slopes downwards, movements along and shifts in aggregate demand, factors that shift aggregate demand and investment: gross, net and fixed capital.

The 5 subtopics

Each one has its own page.

• The four components of aggregate demandAggregate demand and write down its four components, consumption in the context of aggregate demand and net exports rather than exports alone appear in aggregate demand.Open →
• Why the aggregate demand curve slopes downwardsAggregate demand curve.Open →
• Movements along and shifts in aggregate demandWhat moves the economy along the aggregate demand curve, what shifts the whole curve, and why a policy change does the second rather than the first.Open →
• Factors that shift aggregate demandHow a fall in real disposable income affects aggregate demand, how a rise in house prices affects aggregate demand and change in consumer confidence affect aggregate demand.Open →
• Investment: gross, net and fixed capitalGross investment and net investment, capital consumption and gross investment be rising while the capital stock is falling.Open →

What you need to know

Answer each one before you reveal it.

Take Aggregate Demand further

The same content, four other ways.

Commonly confused

Pairs that lose marks when they are blurred together.

• A movement along the aggregate demand curve vs A shift in aggregate demand

  A movement along the aggregate demand curve: the response to a change in the general price level alone. A shift in aggregate demand: the response to a change in any of the four components, at every price level.

• Consumption vs Saving

  Consumption: household spending on goods and services in the current period. Saving: the part of disposable income not spent in the current period.

• Aggregate demand vs Demand for a single good

  Aggregate demand: total planned spending on domestic output at each price level. Demand for a single good: planned purchases of one product at each of its own prices.

Questions from this topic

Each one with the model answer underneath.

1. 1

   Define aggregate demand and write down its four components.

   Model answer

   Aggregate demand is the total planned spending on the goods and services produced within an economy at each general price level over a given period. It is made up of household consumption, investment by firms, government expenditure on goods and services, and net exports, so AD = C + I + G + (X - M). Because it is planned spending at each price level, it is a schedule rather than a single number.

2. 2

   What is consumption in the context of aggregate demand, and roughly how important is it?

   Model answer

   Consumption is household spending on goods and services, covering everything from food and fuel to holidays and haircuts, but excluding the purchase of new housing, which is classified as investment. It is by far the largest component in most developed economies, typically around two thirds of aggregate demand. Its size means that even small percentage changes in consumption move aggregate demand substantially.

3. 3

   What does investment mean when it appears as a component of aggregate demand?

   Model answer

   Investment is spending by firms on capital goods that will be used to produce future output: machinery, vehicles, buildings and software, together with additions to stocks of raw materials and unsold finished goods. Government spending on infrastructure is counted in G instead. It is spending on newly produced capital, not the purchase of existing assets. It is the most volatile component, because it depends heavily on expectations about the future.

4. 4

   Why is buying shares in a company not counted as investment in the aggregate demand sense?

   Model answer

   Buying shares transfers ownership of an existing financial claim from one person to another; no new capital good is produced, so nothing is added to output or demand for output. In economics the word investment is reserved for spending that creates new physical capital. Everyday usage of the word for saving in financial assets is a common source of confusion.

5. 5

   Which government payments count in the G component of aggregate demand, and which do not?

   Model answer

   Spending on goods and services counts: teachers' and nurses' salaries, medicines, road building, defence equipment. Transfer payments such as pensions, benefits and student maintenance do not, because the government receives no goods or services in return. Transfers affect aggregate demand only indirectly, when the households receiving them spend the money, at which point the spending appears as consumption.

6. 6

   Why do net exports rather than exports alone appear in aggregate demand?

   Model answer

   Aggregate demand measures demand for domestically produced output. Exports are foreign spending on domestic output, so they add to it. But the consumption, investment and government spending figures all include purchases of imported goods, which are demand for foreign output, so imports must be subtracted to avoid overstating demand for domestic production. The net figure, X minus M, is the trade sector's true contribution.

What is inside Levo

Six ways to work the same material.

Aggregate Demand revision questions

What does Aggregate Demand cover in CCEA A-Level Economics?

5 subtopics: the four components of aggregate demand, why the aggregate demand curve slopes downwards, movements along and shifts in aggregate demand, factors that shift aggregate demand and investment: gross, net and fixed capital. Each one has its own page with questions and model answers.

How is Aggregate Demand organised?

By the CCEA 4410 specification, subtopic by subtopic, so it matches the order you are taught it in.